Dart

Binary Certificate Extension Data

See more Certificates Examples

Demonstrates how to binary certificate extension data by OID.

The GetExtensionBd method is added in Chilkat v9.5.0.96.

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final cert = CkCert();

  try {
    cert.loadFromFile('qa_data/certs/testCert.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final bd = CkBinData();

  // The particular certificate in this test contains the following extensions

  var oid = '1.2.250.1.71.1.2.5';
  try {
    cert.getExtensionBd(oid, bd);
    print('$oid: ${bd.getEncoded('hex_lower')}');
  } on ChilkatException {
    // cert.getExtensionBd() failed; continue anyway.
  }

  oid = '1.2.250.1.71.1.2.2';
  try {
    cert.getExtensionBd(oid, bd);
    print('$oid: ${bd.getEncoded('hex_lower')}');
  } on ChilkatException {
    // cert.getExtensionBd() failed; continue anyway.
  }

  oid = '1.2.250.1.71.1.2.3';
  try {
    cert.getExtensionBd(oid, bd);
    print('$oid: ${bd.getEncoded('hex_lower')}');
  } on ChilkatException {
    // cert.getExtensionBd() failed; continue anyway.
  }

  oid = '1.2.250.1.71.1.2.7';
  try {
    cert.getExtensionBd(oid, bd);
    print('$oid: ${bd.getEncoded('hex_lower')}');
  } on ChilkatException {
    // cert.getExtensionBd() failed; continue anyway.
  }

  oid = '1.2.250.1.71.4.2.5';
  try {
    cert.getExtensionBd(oid, bd);
    print('$oid: ${bd.getEncoded('hex_lower')}');
  } on ChilkatException {
    // cert.getExtensionBd() failed; continue anyway.
  }

  // Sample output:
  // 1.2.250.1.71.1.2.5: 040180
  // 1.2.250.1.71.1.2.2: 020100
  // 1.2.250.1.71.1.2.3: 1315383032353030303030312f32393030303539313432
  // 1.2.250.1.71.1.2.7: 02010a
  // 1.2.250.1.71.4.2.5: 30060c04534d3236

  // The above binary values are actually ASN.1
  // You can get the ASN.1 decoed by calling GetExtensionAsXml to get it in XML format,
  // and then you extract the values from the XML.

  oid = '1.2.250.1.71.1.2.5';
  var strXml = cert.getExtensionAsXml(oid);
  if (cert.lastMethodSuccess) {
    print('$oid: $strXml');
  }

  oid = '1.2.250.1.71.1.2.2';
  try {
    strXml = cert.getExtensionAsXml(oid);
    print('$oid: $strXml');
  } on ChilkatException {
    // cert.getExtensionAsXml() failed; continue anyway.
  }

  oid = '1.2.250.1.71.1.2.3';
  try {
    strXml = cert.getExtensionAsXml(oid);
    print('$oid: $strXml');
  } on ChilkatException {
    // cert.getExtensionAsXml() failed; continue anyway.
  }

  oid = '1.2.250.1.71.1.2.7';
  try {
    strXml = cert.getExtensionAsXml(oid);
    print('$oid: $strXml');
  } on ChilkatException {
    // cert.getExtensionAsXml() failed; continue anyway.
  }

  oid = '1.2.250.1.71.4.2.5';
  try {
    strXml = cert.getExtensionAsXml(oid);
    print('$oid: $strXml');
  } on ChilkatException {
    // cert.getExtensionAsXml() failed; continue anyway.
  }

  // Sample output:
  // 1.2.250.1.71.1.2.5: <octets>gA==</octets>
  // 1.2.250.1.71.1.2.2: <int>00</int>
  // 1.2.250.1.71.1.2.3: <printable>8025000001/2900059142</printable>
  // 1.2.250.1.71.1.2.7: <int>0A</int>
  // 1.2.250.1.71.4.2.5: <sequence><utf8>SM26</utf8></sequence>

  // "gA==" is the base64 encoded byte values
  // "0A" is hex for decimal 10
}